IME, I find that when I cycled where I am effectively in the gutter, I was generally given less room by overtaking vehicles than when cycling further out into the lane. I deliberately tried this over a few days, on the same road, at same time of day, with similar levels of traffic. I certainly don't cycle in the primary position all the time but I most certainly do when I feel my safety requires it. Plus, I found cycling further out from the edge of the road gave me some *escape room* on the odd occasion a motorist overtook too closely. On the odd occasion a motorist overtook me when I was cycling nearer to the gutter, that escape room was denied me.
I also find a bit of courtesy goes a long way in smoothing on-road relations between cyclist & motorist. I will willingly pull over to the side to allow a bigger vehicle to pass *if it is safe for me to do so*. But it's me who decides when it's safe, not some impatient twerp behind me. I will also acknowledge courtesy shown to me so, for example, if a motorist has stayed patiently behind me whilst I negotiate a pinch point, or a particularly bendy bit of road, once he or she has overtaken me when it's safe to do so, I will acknowledge that courtesy with a thank you wave or verbally - if safe to do so.